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fuel return system rotax 912s

 
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fconnell(at)bigpond.net.a
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PostPosted: Thu Aug 10, 2006 3:04 am    Post subject: fuel return system rotax 912s Reply with quote

Some advice please re rotax fuel return system.
Is this always necessary?
Do some installations run succesfully without0 it,say, with adequate fuel line insulation & perhaps with dedicated air0 vent.to the fuel system
What is its main purpose-to cool the fuel by0 recirculating warm fuel back into the tank,or perhaps to allow any fuel vapour0 to be purged from the system?
All advice welcome.
Frank Connell Australia.

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paul.mitchell2(at)homecal
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PostPosted: Thu Aug 10, 2006 3:43 am    Post subject: fuel return system rotax 912s Reply with quote

Frank,
I live in the Uk and we do have some warm days. I0 would say the return line is a must. It's purpose is to return any vapour lock0 or air bubbles back to the tank. I can see mine while I am flying and there are0 bubbles going back to the tank in a steady stream. Not a lot but they are0 there.
Paul Mitchell
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thilo.kind(at)gmx.net
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PostPosted: Thu Aug 10, 2006 10:33 am    Post subject: fuel return system rotax 912s Reply with quote

Hi Frank,

most Rotax 912, that I know of, don't have the fuel0 return (including mine, a Zodiac CH 601 HDS). No problems with that set-up,0 except during re-starts on hot days. In such cases, the hot engine and the lack0 of air going through the cowling will create vapor lock, which will make it0 difficult to re-start. One way is to take the cowling off, so that the hot air0 can get out. Another way, we just learned from a Rotx shop is to switch on the0 electrical fuel pump, keep it running for 3 minutes, switch it off, push a0 throttle ever so slightly forward and start (without choke). Works well on the0 D40 in our flying club here. I haven't tried that yet on my Zodiac.

Best regards

Thilo Kind
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